English ⇄ Russian +

at least before stresses
product.	не менее чем за (Yeldar Azanbayev)
at least ... before
product.	не позднее чем за (Yeldar Azanbayev)
at least so and so much time before
offic.	не позднее, чем за столько-то времени до (igisheva)

at least ... before : 1 phrase in 1 subject

Makarov

1